Question about Chevrolet TrailBlazer EXT

3 Answers

I have a knocking or tapping noise in my chevy trailblazer ext on the rear last set of seats on the passenger side. Its driving me crazy and I dont know what it is. Please help!

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  • dluigi59 Feb 07, 2010

    no its on the inside of the car. It seems like it is tapping by the cup holder on the rear seat. It sounds like you are tapping on the rear side window with a piece of metal. It tapps for a short while and then stopps. Only tapps after car is started. Maybe keeps going for abot 20 -30 seconds and then stops

  • dluigi59 Feb 07, 2010

    but the noise in inside the car not outside or under the car. Is there anything mechanical in the side panel of the car? Is there a fan or something else back there? I do have rear heat and cool controlls for the back seats. Again the noise is inside the car, not outside.

  • dluigi59 Feb 07, 2010

    please see prior comment, please do not route me to a mechanic. I am my mechanic, so please put it in a womans language

  • dluigi59 Feb 08, 2010

    thanks can you tell me what it looks like

  • dluigi59 Feb 08, 2010

    thanks i appreciate your help and not telling me to go to a garage for help.

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3 Answers

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  • Master
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Hello. I believe I can help you with this problem. It sounds as if the rear HVAC door actuator is malfunctioning. To verify this you can remove the inside rear quarter panel and unplug the actuator, the clicking should stop. Those plugs can be difficult so just be careful to no break the tabs on the plug. If you look online you can buy a new actuator cheaper than the GM dealer. I hope this helps you with the problem, please don't hesitate to let me know if you need any further information on this.

Posted on Feb 07, 2010

  • BeninVa
    BeninVa Feb 08, 2010

    Hello, I understand. Inside the vehicle, at the rear passenger side behind that trim panel is the heating/cooling control door. There is an "actuator" that controls the door behind the trim panel. Once you remove that plastic panel you will see the actuator, and the wire plugged into it.

  • BeninVa
    BeninVa Feb 08, 2010

    You are very welcome. This is actually a pretty easy repair and once you get the panel off you will see the actuator. I am sure once you carefully unplug it the clicking will stop.

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  • Chevrolet Master
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Have the exhaust system checked, this noise is very likley a exhaust pipe or muffler hitting the undercarriage of the truck, another possibilty is a broken heat shield, this is common, most muffler shops will do the inspection for free.

Posted on Feb 07, 2010

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  • yadayada
    yadayada Feb 07, 2010

    sorry can't help, look under the seats and make sure nothing was left there.

  • yadayada
    yadayada Feb 07, 2010

    do u have any idea how hard it is to try and hear a noise from a computer keyboard, if you are really bugged by this see a GM dealer, the have special sound detection equip than isolate the source in about 1 hour of labor time, well worth the cost.

  • yadayada
    yadayada Feb 08, 2010

    are u going to fix this

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  • Master
  • 11,896 Answers

Most likely it is probably the exhaust vibrating. It could be the plastic shield on the rear strut/shocks too,

Posted on Feb 07, 2010

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  • Nate Stansfield
    Nate Stansfield Feb 07, 2010

    There may be a relay in the back for the heat/cooling controls. Also if you have a rear wiper, or rear hatch, it could be that relay you hear ticking. Do make sure the rears seats are completely and securely fasted in place.

  • Nate Stansfield
    Nate Stansfield Feb 08, 2010

    All relays are little square boxes. Either black, gray or blue, usually black.

  • Nate Stansfield
    Nate Stansfield Feb 08, 2010

    NOT A PROBLEM! Us experts are supposed to help you help fix things yourself and not to refer you to repair centers.

    This is what a relay looks like. They may be black in color as well. Some are blue but the blue ones are usually in the engine area and aren't too many of the blue ones.


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